Final answer:
The standard cell notation of a galvanic cell made with magnesium (Mg) and gold (Au) is d. au (aq) | au(s) || mg(s) | mg2 (aq).
Step-by-step explanation:
The standard cell notation of a galvanic cell made with magnesium (Mg) and gold (Au) is d. au (aq) | au(s) || mg(s) | mg2 (aq).
The anode, where oxidation occurs, is represented on the left side of the notation. In this case, gold (Au) is being oxidized and is written as Au(s) on the left side.
The cathode, where reduction occurs, is represented on the right side of the notation. In this case, magnesium (Mg) is being reduced and is written as Mg(s) on the right side.
The two vertical lines represent a salt bridge or a porous barrier that allows the movement of ions between the two half-cells.